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A060668 as a simple table

na(n)
18
220
3220
4272
5300
6368
7416
8456
9500
10656
11732
12848
13876
141092
151160
161212
171236
181328
191376
201424
211568
221624
231716
241808
252144
262244
272336
282420
292460
302480
312528
322556
332768
343056
353080
363252
373320
383344
393536
403560
413612
423728
433732
443900
454016

[8,20,220,272,300,368,416,456,500,656,732,848,876,
 1092,1160,1212,1236,1328,1376,1424,1568,1624,1716,
 1808,2144,2244,2336,2420,2460,2480,2528,2556,2768,
 3056,3080,3252,3320,3344,3536,3560,3612,3728,3732,
 3900,4016]